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#1
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Garmin Behind the Curve on WAAS GPS VNAV Approaches
"Scott Moore" wrote in message ... Speaking only for myself, its pretty damm confusing exactly what would be done with WAAS even if implemented. Garmins' other units that accept WAAS is now implemented and IFR approved as of the past week. If a receiver were approved for WAAS approaches, then TODAY you could use VNAV/LNAV miniums on GPS RNAV approaches instead of LNAV minimums. Presumably (though I am not certain) a VNAV/LNAV GPS RNAV approach would be considered a precision approach. UPSAT's CNX80 web page touts the airports you have access to today with WAAS; yet the version of the POH supplement posted on their site says in the legal fineprint that precision approaches are NOT permitted. So I am not certain if you can or cannot fly VNAV/LNAV GPS approach mininums TODAY on a CNX-80. What I would like to see from Garmin is a controlled descent option on non-precision GPS approaches, which would be perfectly legal to implement right now (because it is inside the "dive and drive" If you want to do this as a backup to other navigation, you can do this now with the VNAV function on the Garmin 430/530, albeit not yet with WAAS. Nonetheless, there is a big question whether this will make sense for an approach not explicitly designed as a precision approach. Many non-precision approaches have a missed approach point from which a suitable straight-in landing cannot be made; so you could well have a controlled descent to the middle of the field an then in turn have to circle. -- Richard Kaplan, CFII www.flyimc.com |
#2
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Richard Kaplan wrote: "Scott Moore" wrote in message ... Speaking only for myself, its pretty damm confusing exactly what would be done with WAAS even if implemented. Garmins' other units that accept WAAS is now implemented and IFR approved as of the past week. If a receiver were approved for WAAS approaches, then TODAY you could use VNAV/LNAV miniums on GPS RNAV approaches instead of LNAV minimums. Presumably (though I am not certain) a VNAV/LNAV GPS RNAV approach would be considered a precision approach. UPSAT's CNX80 web page touts the airports you have access to today with WAAS; yet the version of the POH supplement posted on their site says in the legal fineprint that precision approaches are NOT permitted. So I am not certain if you can or cannot fly VNAV/LNAV GPS approach mininums TODAY on a CNX-80. I wouldn't be so certain of that. Today's VNAV minimums are predicated on IFR-certified Baro VNAV equipment, not WAAS. WAAS approaches have yet to appear from the FAA |
#4
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So does the CNX-80 meet the requirement today? Is it "WAAS equipment
approved for precision approach"? Mike MU-2 "Lockheed employee" Mississippi@ home.com wrote in message ... I have a Jeppesen briefing bulletin (DEN 00-A) that states: LNAV/VNAV must have WAAS equipment approved for precision approach, or RNP-0.3 system based on GPS or DME/DME, with an IFR approach approved Baro-VNAV system. It appears that either is suitable for going to VNAV minimums On Wed, 16 Jul 2003 05:47:50 -0700, wrote: Richard Kaplan wrote: "Scott Moore" wrote in message ... Speaking only for myself, its pretty damm confusing exactly what would be done with WAAS even if implemented. Garmins' other units that accept WAAS is now implemented and IFR approved as of the past week. If a receiver were approved for WAAS approaches, then TODAY you could use VNAV/LNAV miniums on GPS RNAV approaches instead of LNAV minimums. Presumably (though I am not certain) a VNAV/LNAV GPS RNAV approach would be considered a precision approach. UPSAT's CNX80 web page touts the airports you have access to today with WAAS; yet the version of the POH supplement posted on their site says in the legal fineprint that precision approaches are NOT permitted. So I am not certain if you can or cannot fly VNAV/LNAV GPS approach mininums TODAY on a CNX-80. I wouldn't be so certain of that. Today's VNAV minimums are predicated on IFR-certified Baro VNAV equipment, not WAAS. WAAS approaches have yet to appear from the FAA |
#5
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"Mike Rapoport" wrote in message ... So does the CNX-80 meet the requirement today? Is it "WAAS equipment approved for precision approach"? Why are you asking a sock a technical question, Mike? Uspat spent their own money to develop the idea of merging pressure altitude and a subset of the TAWS database and for that they deserve the market. At least until the other manufacturers catch up. |
#6
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wrote in message ... I wouldn't be so certain of that. Today's VNAV minimums are predicated on IFR-certified Baro VNAV equipment, not WAAS. WAAS approaches have yet to appear from the FAA From TERPS section 6: NOTE: The published minima lines will identify required RNAV sensors; e.g., LPV, LNAV/VNAV (includes degraded WAAS and Baro VNAV), or LNAV (includes GPS and WAAS without glidepath). A single RNAV approach will be published depicting LPV and/or LNAV/VNAV, and/or LNAV minimums where they share the same courses and altitudes. I read this to say that if a CNX-80 is approved for WAAS approaches then it could fly a current published RNAV (GPS) approach to VNAV minimums. Again, however, I am unclear from UPSAT's data on its website and manuals what the actual approved status is for the CNX-80. -- Richard Kaplan, CFII www.flyimc.com |
#7
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I don't know if "behind" is the right word. Garmin has had WAAS on numerous
products for a couple of years now. There are valid reasons to try to have the best product on the market instead of the first product. Mike MU-2 "Richard Kaplan" wrote in message news:6823bf21e87c61799d150096f329071b@TeraNews... Garmin's website now says they are "committed" to providing WAAS GPS approach capability for the 400/500 series by the "end of 2004." UPSAT's site states that their CNX-80 is WAAS approved now but I cannot find an explicit statement that it supports WAAS approaches at this point. Does anyone know for sure if the CNX-80 supports WAAS GPS approaches *now*? In any event, can Garmin really be that far behind the curve as to plan WAAS only fo rthe "end of 2004"? This seems very much atypical for Garmin and almost an embarrassment for them. -- Richard Kaplan, CFII www.flyimc.com |
#8
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"Mike Rapoport" wrote in message ... I don't know if "behind" is the right word. Garmin has had WAAS on numerous products for a couple of years now. There are valid reasons to try to have the best product on the market instead of the first product. Garmin is behind because Upsat did the sensor merging on their own initiative. I stood right there and watched the Transport Directorate say "no" to the idea and FAA's chief scientist start running numbers in his head. UPS was on the phone before the smoke break ended. WAAS alone could not add any new services to existing GPS. John P. Tarver, MS/PE |
#9
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"Tarver Engineering" wrote in message ... head. UPS was on the phone before the smoke break ended. WAAS alone could not add any new services to existing GPS. So are you saying that the CNX-80 is approved or will be approved to fly approaches which the Garmin 530 never will be able to fly? And are you saying in fact that the Garmin 530 will never be approved to fly VNAV, LPV, PV, or other approaches with lower minimums than current GPS approaches? -- Richard Kaplan, CFII www.flyimc.com |
#10
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"Richard Kaplan" wrote in message ... "Tarver Engineering" wrote in message ... head. UPS was on the phone before the smoke break ended. WAAS alone could not add any new services to existing GPS. So are you saying that the CNX-80 is approved or will be approved to fly approaches which the Garmin 530 never will be able to fly? Garmin has already announced plans to upgrade the 530. Garmin has also announced plans to make the 530 a fully TAWS compliant display, as well. I know some repair stations that are just barely getting by on TAWS installations and they hope Garmin takes a long time to make the release. And are you saying in fact that the Garmin 530 will never be approved to fly VNAV, LPV, PV, or other approaches with lower minimums than current GPS approaches? No. I am writing that Garmin is now going to have to play catch up. John P. tarver, MS/PE |
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